[mythtv] Not decoding enough audio data?

[Michael T. Dean]

On 04/24/2010 05:15 PM, Ed W wrote:
> Hi, I have seen stutters with audio for some years now and only now 
> had some time to debug it a little.  In general it occurs during blank 
> frames on DVB-T streams (UK).  However, I'm also seeing it 
> occasionally in other situations now.
>
> Having instrumented the audio layer, the problem actually seems to be 
> the audio ringbuffer running dry and no samples left to feed the 
> soundcard.  Now, I poked around a little trying to figure out the 
> feedback loop which is controlling how much audio data is being 
> decoded at any time, but confess I can't see how this is happening?
>
> Can someone please give me a brief heads up on which parts of the code 
> to look at more closely so I can debug this on my setup please?

This sounds exactly like the bug that:

Extra audio buffering
Enable this setting if MythTV is playing "crackly" audio.  This setting 
affects digital tuners (QAM/DVB/ATSC) and hardware encoders.  It will 
have no effect on framegrabbers (MPEG-4/RTJPEG).  MythTV will keep extra 
audio data in its internal buffers to workaround this bug.

was meant to work around.  Also, I think Jean-Yves Avenard has a patch 
that fixes the actual bug.  I don't think it's gone into trunk (let 
alone any -fixes branches), yet.

Mike